Why is rifling present in the bore of the barrel

Question

Assignment:

Approximately 70% to 75% of homicides are committed with firearms. Write 4 to 5 pages that answer the following questions:
 
Part 1

• Explain how a handgun is manufactured, most specifically the bore of the barrel.
• Why is rifling present in the bore of the barrel? What is the purpose of rifling?
• Compare and contrast a revolver versus a semiautomatic handgun. How is the caliber of a handgun determined?
• Explain the difference between a bullet, shell casing, and a projectile.
• When examining a handgun, projectile, or shell casing, provide examples of class and individual characteristics.
• What is the difference between a perforating gunshot wound and a penetrating gunshot wound?
• Compare and contrast the characteristics of an entrance wound versus an exit wound.

Part 2

• What are the characteristics that might exist or not exist for determining the muzzle-to-target distance?
• There are four ranges. At each range, what is the muzzle-to-target distance?

1. contact to near contact
2. close range
3. medium range
4. distant range

• Explain the characteristics that might exist or not exist at each range. For example, a bullet hole will be a characteristic at each range.
• What types of evidence would an investigator document from a handgun of a death scene?

Cite all references using APA citation format.